[Bug] The same alias cannot be used for more than one asset.

test.ts

import {MosaicId, NamespaceHttp} from "symbol-sdk";
const util = require('util');

const url = 'http://api-01.us-west-1.symboldev.network:3000';
const namespaceHttp = new NamespaceHttp(url);

const mosaicIds = [
    new MosaicId('2DFD0AF0ED436D59'),
    new MosaicId('2EED9EA233EC037F'),
    new MosaicId('7D4542F3474D7D71')];

namespaceHttp
    .getMosaicsNames(mosaicIds)
    .subscribe(x => {
        console.log(util.inspect(x, false, null, true))
    });

/*
[[
  MosaicNames {
    mosaicId: MosaicId { id: Id { lower: 3980619097, higher: 771558128 } },
    names: [
      NamespaceName {
        namespaceId: NamespaceId {
          fullName: 'aa',
          id: Id { lower: 279250019, higher: 3852319689 }
        },
        name: 'aa',
        parentId: undefined
      }
    ]
  },
  MosaicNames {
    mosaicId: MosaicId { id: Id { lower: 871105407, higher: 787324578 } },
    names: [
      NamespaceName {
        namespaceId: NamespaceId {
          fullName: 'aa',
          id: Id { lower: 279250019, higher: 3852319689 }
        },
        name: 'aa',
        parentId: undefined
      }
    ]
  },
  MosaicNames {
    mosaicId: MosaicId { id: Id { lower: 1196260721, higher: 2101691123 } },
    names: [
      NamespaceName {
        namespaceId: NamespaceId {
          fullName: 'aa',
          id: Id { lower: 279250019, higher: 3852319689 }
        },
        name: 'aa',
        parentId: undefined
      }
    ]
  }
]
*/